/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/

#include "zbxsysinfo.h"
#include "../sysinfo.h"

int	system_swap_size(AGENT_REQUEST *request, AGENT_RESULT *result)
{
/*
 *  FreeBSD 7.0 i386
 */
#ifdef XSWDEV_VERSION	/* defined in <vm/vm_param.h> */
	char		*swapdev, *mode;
	int		mib[16], *mib_dev;
	size_t		sz, mib_sz;
	struct xswdev	xsw;
	zbx_uint64_t	total = 0, used = 0;

	if (2 < request->nparam)
	{
		SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
		return SYSINFO_RET_FAIL;
	}

	swapdev = get_rparam(request, 0);
	mode = get_rparam(request, 1);

	sz = ARRSIZE(mib);

	if (-1 == sysctlnametomib("vm.swap_info", mib, &sz))
	{
		SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Cannot obtain \"vm.swap_info\" system parameter: %s",
				zbx_strerror(errno)));
		return SYSINFO_RET_FAIL;
	}

	mib_sz = sz + 1;
	mib_dev = &(mib[sz]);

	*mib_dev = 0;
	sz = sizeof(xsw);

	while (-1 != sysctl(mib, mib_sz, &xsw, &sz, NULL, 0))
	{
		if (NULL == swapdev || '\0' == *swapdev || 0 == strcmp(swapdev, "all")	/* default parameter */
				|| 0 == strcmp(swapdev, devname(xsw.xsw_dev, S_IFCHR)))
		{
			total += (zbx_uint64_t)xsw.xsw_nblks;
			used += (zbx_uint64_t)xsw.xsw_used;
		}
		(*mib_dev)++;
	}

	if (NULL == mode || '\0' == *mode || 0 == strcmp(mode, "free"))
	{
		SET_UI64_RESULT(result, (total - used) * getpagesize());
	}
	else if (0 == strcmp(mode, "total"))
	{
		SET_UI64_RESULT(result, total * getpagesize());
	}
	else if (0 == strcmp(mode, "used"))
	{
		SET_UI64_RESULT(result, used * getpagesize());
	}
	else if (0 == strcmp(mode, "pfree"))
	{
		SET_DBL_RESULT(result, 0 != total ? ((double)(total - used) * 100.0 / (double)total) : 100.0);
	}
	else if (0 == strcmp(mode, "pused"))
	{
		SET_DBL_RESULT(result, 0 != total ? ((double)used * 100.0 / (double)total) : 0.0);
	}
	else
	{
		SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid second parameter."));
		return SYSINFO_RET_FAIL;
	}

	return SYSINFO_RET_OK;
#else
	SET_MSG_RESULT(result, zbx_strdup(NULL, "Agent was compiled without support for \"xswdev\" structure."));

	return SYSINFO_RET_FAIL;
#endif
}
